a rare, very hard and brittle, silver-gray chemical element, one of the platinum metals, used as a hardener in alloys of platinum and palladium and as a catalyst: symbol, Ru; at. no. 44
Origin of rutheniumModL: so named (1828) by G. W. Osann, Estonian-Russian chemist who produced it in impure form ; from Medieval Latin Ruthenia, Russia (source of the ore) + -ium
A hard silver-white acid-resistant metallic element that is found in platinum ores and is used to harden platinum and palladium for jewelry and in alloys for nonmagnetic wear-resistant instrument pivots and electrical contacts. Atomic number 44; atomic weight 101.07; melting point 2,334°C; boiling point 4,150°C; specific gravity 12.1 (20°C); valence 0, 1, 2, 3, 4, 5, 6, 7, 8. See Periodic Table.
Origin of rutheniumFrom Medieval Latin Ruthenia, Russia, from Ruthen&imacron;, Russians, from Russian Rusin, from Old Russian Rus&ibreve;, Russian; see Russian.
- A metallic chemical element (symbol Ru) with an atomic number of 44.
Ruthenia + -ium